/* ==========================================================================
   CSS Custom Properties (Variables) - Bomii Dark Purple/Cyan Theme
   ========================================================================== */
:root {
  /* Colors - Dark Purple/Cyan Theme */
  --color-primary: #8b5cf6;
  --color-primary-dark: #7c3aed;
  --color-primary-light: #a78bfa;
  --color-secondary: #06b6d4;
  --color-secondary-dark: #0891b2;
  --color-accent: #c084fc;

  --color-text: #f8fafc;
  --color-text-light: #94a3b8;
  --color-text-muted: #64748b;
  --color-text-inverse: #0f0f1a;

  --color-background: #0f0f1a;
  --color-background-alt: #1a1a2e;
  --color-background-card: #16162a;
  --color-background-dark: #0a0a12;

  --color-border: #2d2d4a;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #8b5cf6 0%, #06b6d4 100%);
  --gradient-hero: linear-gradient(135deg, #1a1a2e 0%, #0f0f1a 50%, #1a0a2e 100%);
  --gradient-card: linear-gradient(145deg, #1a1a2e 0%, #16162a 100%);
  --gradient-glow: radial-gradient(ellipse at center, rgba(139, 92, 246, 0.15) 0%, transparent 70%);

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --font-family-korean: 'Apple SD Gothic Neo', 'Noto Sans KR', 'Malgun Gothic', sans-serif;
  --font-size-base: 16px;
  --font-size-sm: 0.875rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3rem;

  --line-height: 1.6;
  --line-height-tight: 1.2;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  --spacing-4xl: 6rem;

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px rgba(139, 92, 246, 0.3);
  --shadow-glow-cyan: 0 0 30px rgba(6, 182, 212, 0.3);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;

  /* Container */
  --container-max-width: 1200px;
}

/* ==========================================================================
   Reset & Base Styles
   ========================================================================== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  line-height: var(--line-height);
  color: var(--color-text);
  background-color: var(--color-background);
}

/* Korean text support */
[lang='ko'],
.lang-ko {
  font-family: var(--font-family-korean);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-light);
}

ul {
  list-style: none;
}

/* ==========================================================================
   Utility Classes
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.section-title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--spacing-2xl);
  color: var(--color-text);
}

.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-base);
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--color-text);
  border: none;
}

.btn-primary:hover {
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
  color: var(--color-text);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-secondary);
  border-color: var(--color-secondary);
}

.btn-secondary:hover {
  background-color: var(--color-secondary);
  color: var(--color-text-inverse);
}

.btn-large {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-lg);
}

.btn-download {
  background-color: var(--color-background-card);
  color: var(--color-text);
  padding: var(--spacing-md) var(--spacing-xl);
  gap: var(--spacing-md);
  border: 1px solid var(--color-border);
}

.btn-download:hover {
  background-color: var(--color-background-alt);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow);
  color: var(--color-text);
}

.btn-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  line-height: 1.3;
}

.btn-text small {
  font-size: var(--font-size-sm);
  font-weight: 400;
  color: var(--color-text-light);
}

.btn-icon {
  font-size: var(--font-size-2xl);
}

/* ==========================================================================
   Navigation
   ========================================================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: rgba(15, 15, 26, 0.9);
  backdrop-filter: blur(10px);
  z-index: 1000;
  border-bottom: 1px solid var(--color-border);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.logo {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.logo-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
}

.logo:hover {
  color: var(--color-primary-light);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

.nav-links a {
  color: var(--color-text-light);
  font-weight: 500;
}

.nav-links a:hover {
  color: var(--color-text);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
}

.nav-toggle span {
  display: block;
  width: 25px;
  height: 2px;
  background-color: var(--color-text);
  transition: var(--transition-fast);
}

/* Language Switcher */
.lang-switcher {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  background-color: var(--color-background-card);
  border-radius: var(--radius-full);
  padding: var(--spacing-xs);
  border: 1px solid var(--color-border);
}

.lang-btn {
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  background: none;
  border: none;
  color: var(--color-text-light);
}

.lang-btn.active {
  background: var(--gradient-primary);
  color: var(--color-text);
}

.lang-btn:hover:not(.active) {
  color: var(--color-text);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
  padding: calc(var(--spacing-4xl) + 70px) 0 var(--spacing-4xl);
  background: var(--gradient-hero);
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--gradient-glow);
  pointer-events: none;
}

.hero-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
}

.hero-content {
  max-width: 600px;
  position: relative;
  z-index: 1;
}

.hero h1 {
  font-size: var(--font-size-5xl);
  font-weight: 800;
  line-height: var(--line-height-tight);
  margin-bottom: var(--spacing-lg);
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  color: var(--color-text-light);
  margin-bottom: var(--spacing-xl);
}

.hero-actions {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.hero-image {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.hero-image img {
  max-width: 100%;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
}

/* ==========================================================================
   Features Section
   ========================================================================== */
.features {
  padding: var(--spacing-4xl) 0;
  background-color: var(--color-background);
  position: relative;
}

.features::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-border), transparent);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
}

.feature-card {
  background: var(--gradient-card);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  text-align: center;
  border: 1px solid var(--color-border);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-glow);
  border-color: var(--color-primary);
}

.feature-icon {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--spacing-md);
  display: inline-block;
}

.feature-card h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.feature-card p {
  color: var(--color-text-light);
}

/* ==========================================================================
   Screenshots Section
   ========================================================================== */
.screenshots {
  padding: var(--spacing-4xl) 0;
  background-color: var(--color-background-alt);
  overflow: hidden;
}

.screenshot-gallery {
  display: flex;
  gap: var(--spacing-lg);
  overflow-x: auto;
  padding: var(--spacing-lg) 0;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.screenshot-gallery::-webkit-scrollbar {
  display: none;
}

.screenshot-item {
  flex: 0 0 auto;
  width: 280px;
  scroll-snap-align: center;
  position: relative;
}

.screenshot-item img {
  width: 100%;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  transition: transform var(--transition-base);
}

.screenshot-item:hover img {
  transform: scale(1.02);
}

.screenshot-caption {
  text-align: center;
  margin-top: var(--spacing-md);
  color: var(--color-text-light);
  font-size: var(--font-size-sm);
}

/* Screenshot navigation dots */
.screenshot-dots {
  display: flex;
  justify-content: center;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-xl);
}

.screenshot-dot {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  background-color: var(--color-border);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.screenshot-dot.active {
  background: var(--gradient-primary);
  width: 24px;
}

/* ==========================================================================
   About Section
   ========================================================================== */
.about {
  padding: var(--spacing-4xl) 0;
  background-color: var(--color-background);
}

.about-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.about-content p {
  font-size: var(--font-size-lg);
  color: var(--color-text-light);
  margin-bottom: var(--spacing-lg);
}

/* ==========================================================================
   Download Section
   ========================================================================== */
.download {
  padding: var(--spacing-4xl) 0;
  background: var(--gradient-primary);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.download::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
  animation: pulse 4s ease-in-out infinite;
}

@keyframes pulse {
  0%,
  100% {
    transform: scale(1);
    opacity: 0.5;
  }
  50% {
    transform: scale(1.1);
    opacity: 0.3;
  }
}

.download .section-title {
  color: var(--color-text);
  position: relative;
  z-index: 1;
}

.download-subtitle {
  color: rgba(255, 255, 255, 0.9);
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-xl);
  position: relative;
  z-index: 1;
}

.download-buttons {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}

.download .btn-download {
  background-color: rgba(0, 0, 0, 0.3);
  border-color: rgba(255, 255, 255, 0.2);
}

.download .btn-download:hover {
  background-color: rgba(0, 0, 0, 0.5);
  border-color: rgba(255, 255, 255, 0.4);
}

.btn-store-icon {
  width: 28px;
  height: 28px;
  object-fit: contain;
}

/* ==========================================================================
   Contact Section
   ========================================================================== */
.contact {
  padding: var(--spacing-4xl) 0;
  background-color: var(--color-background-alt);
}

.contact-form {
  max-width: 600px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: var(--font-size-base);
  background-color: var(--color-background-card);
  color: var(--color-text);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--color-text-muted);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.2);
}

.contact-form .btn {
  width: 100%;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
  background-color: var(--color-background-dark);
  color: var(--color-text);
  padding: var(--spacing-3xl) 0 var(--spacing-lg);
  border-top: 1px solid var(--color-border);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-brand .logo {
  display: inline-flex;
  margin-bottom: var(--spacing-sm);
}

.footer-brand p {
  color: var(--color-text-light);
}

.footer-links h4 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.footer-links a {
  color: var(--color-text-light);
}

.footer-links a:hover {
  color: var(--color-text);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-xl);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
}

/* ==========================================================================
   Mobile Responsive Styles
   ========================================================================== */
@media (max-width: 992px) {
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-content {
    max-width: 100%;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-image {
    order: -1;
    margin-bottom: var(--spacing-xl);
  }

  .hero-image img {
    max-width: 300px;
  }
}

@media (max-width: 768px) {
  :root {
    --font-size-5xl: 2.25rem;
    --font-size-4xl: 2rem;
    --font-size-3xl: 1.75rem;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background-color: var(--color-background);
    flex-direction: column;
    padding: var(--spacing-lg);
    gap: var(--spacing-md);
    box-shadow: var(--shadow-lg);
    display: none;
    border-bottom: 1px solid var(--color-border);
  }

  .nav-links.active {
    display: flex;
  }

  .hero {
    min-height: auto;
    padding-top: calc(var(--spacing-2xl) + 70px);
    padding-bottom: var(--spacing-2xl);
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .hero-actions .btn {
    width: 100%;
    max-width: 300px;
  }

  .download-buttons {
    flex-direction: column;
    align-items: center;
  }

  .btn-download {
    width: 100%;
    max-width: 280px;
  }

  .screenshot-item {
    width: 240px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-md);
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .screenshot-item {
    width: 200px;
  }

  .lang-switcher {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 999;
    box-shadow: var(--shadow-lg);
  }
}